Noise was the main reason why I sold my rack. If you think it's bad with the hard top, try it with a soft top some day. The wind turbulence causes the soft top to flutter and flap, making it sound like someone's sitting over the back seats with a huge drum. The other reason was clearance on the trail.
The good news was I could take the entire rack except for the front support/light bar off in 15 minutes and leave it behind. Which, it turns out, I did more and more often until it just didn't get used at all. Still I liked the light bar, though it still caused some noise.
Eventually I sold the whole thing. I was honest and explained the problem with noise to the buyer, but he was committed. Two months later he put the rack up for sale again.
I'm a JKO Reject